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Fitted an Ultegra 6700 rear mech on my mtb today.Running a 9 spd 32-11 cassette and all seems well on a quick spin around my local road.Only fitted it as it was lighter than an XT rear mech,and cheaper than a XTR one.Will I have any issue's once I go off road?? Any other weight weenie mtbers use road parts on their mtbs??

a DA 7800 mech running a 27-12 was semi-common for plantation racing near here. No dramas. They can be tuned light and strong too! It won't be flash if you need really big cogs (I was surprised you managed to get it running well on a 32....the old DA would not have done that)

Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!Edit: 2015: darn near won the best South Island series (got second in age-group)..woo hoo Racy Theremery is back!!

I have an Ultegra 6700 on my 1x6, and it has been amazing! I think the combo of the short cage (in my case), smaller cassette stack and stiff springs allowed me to also get away without using a seat tube mounted chain keeper. Done lots of miles on rough terrain and have yet to experience an issue with this setup.

I guess something for people to take into account, is simply that one combo of cassette and RD that works fine on one bike, may not work on another all that well simply because of the differences in hanger length/position.